Bills: Buffalo coach Chan Gailey's job is secure, though quarterback Ryan Fitzpatrickshould expect to face a challenge for the starting job next season. That was the assessment general managerBuddy Nixprovided as the Bills (3-4) prepare to travel to play at Houston (6-1) on Sunday. Nix went public in backing Gailey, saying he wanted to put to rest any doubts about the coach's future beyond this season. As for quarterback, Nix defended Fitzpatrick's performance while at the same time saying he intends to bring in a player to develop and compete for the job. Nix said quarterback backups Tyler Thigpenand Tarvaris Jackson are both in the final year of their contracts.